This charger is designed to charge Nickel Metal Hydryde NiMH and Nickel Cadium NiCD AA and AAA type Rechragable batteries . It quicklyy Recharges from to 4 AA or AAA type Ni-MH or Ni-CD Batteris. It has micro processor technology for better usage of power consumption and charge management , The LCD display Panel indicate the status of carging , The USB slot can be used to charge mobile phones or mp3 players etc. The Trickle charge technology would be used just after the batteries are charged.